01 - Set the oven to 425°F (220°C) to warm up.
02 - Pat the chicken thighs dry with paper towels and season all sides evenly with salt and pepper.
03 - Combine olive oil, minced garlic, lemon zest and juice, thyme, rosemary, and paprika in a large bowl; whisk until uniform.
04 - Add the chicken thighs into the marinade, ensuring each piece is thoroughly coated; let rest for at least 10 minutes to absorb flavors.
05 - On a large baking sheet or roasting pan, toss the halved potatoes and red onion wedges with a drizzle of olive oil, salt, and pepper.
06 - Place the marinated chicken thighs skin-side up atop the vegetables; pour any remaining marinade evenly over all components.
07 - Cook in the heated oven for 40 to 45 minutes until chicken is golden and reaches an internal temperature of 165°F (74°C), and potatoes are tender.
08 - For a crispier skin, broil the dish on high for 2 to 3 minutes at the end of roasting.
09 - Sprinkle chopped fresh parsley and serve with lemon wedges as desired.